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Accelerator Physics

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2020-01-25
10:34
Sub-micron scale transverse electron beam size diagnostics methodology based on the analysis of optical transition radiation source distribution / Aryshev, A (KEK, Tsukuba) ; Ainsworth, R (Royal Holloway, U. of London) ; Aumeyr, T (Royal Holloway, U. of London) ; Bergamaschi, M (Royal Holloway, U. of London) ; Boogert, S T (Royal Holloway, U. of London) ; Karataev, P (Royal Holloway, U. of London) ; Kieffer, R (CERN) ; Kruchinin, K (Royal Holloway, U. of London) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) et al.
Optical Transition Radiation (OTR) appearing when a charged particle crosses a boundary between two media with different dielectric properties has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The resolution of the conventional monitors is defined by the dimensions of the Point Spread Function (PSF) distribution, i.e. [...]
2020 - 18 p. - Published in : JINST 15 (2020) P01020 Fulltext: PDF;

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2020-01-25
10:34
Source of horizontal instability at the CERN Proton Synchrotron Booster / Koukovini-Platia, E (CERN) ; Barnes, M J (CERN) ; Bartosik, H (CERN) ; Rumolo, G (CERN) ; Sermeus, L (CERN) ; Zannini, C (CERN)
The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation in the 1970s. These instabilities appear at specific beam energies and range of working points. [...]
2020 - 16 p. - Published in : Phys. Rev. Accel. Beams 22 (2020) 124201 Fulltext: PDF;

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2020-01-25
10:34
Breakdown localisation in a pulsed DC electrode system / Profatilova, Iaroslava (CERN) ; Stragier, Xavier (CERN ; Eindhoven, Tech. U.) ; Calatroni, Sergio (CERN) ; Kandratsyeu, Aleh (Lisbon, CFTP) ; Rodriguez Castro, Enrique (CERN) ; Wuensch, Walter (CERN)
Breakdown localisation is an important diagnostic for studies of vacuum arcs in high electromagnetic field systems such as DC electrodes and radio frequency (RF) accelerating structures. For example, determining the position of individual breakdowns and corresponding distributions of ensembles of breakdowns are important measurements in high-gradient X-band test stands (CERN, SLAC, KEK) where these measurements are made by monitoring the RF signals.A highly precise breakdown localisation technique has been developed for the CLIC (Compact LInear Collider) pulsed DC electrode systems. [...]
2020 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 953 (2020) 163079 Fulltext: PDF;

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2020-01-23
17:31
MD 3584: Long-Range Beam-Beam 2018 / Karastathis, Nikos ; Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN)
A recurrent issue of the LHC operation, observed both during Run1 and Run2 is the asymmetric behaviour of the two beams in terms of particle losses. [...]
CERN-ACC-NOTE-2020-0011. - 2020. - 29 p.
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2020-01-23
14:41
Study of the Transverse Mode Coupling Instability in the CERN Large Hadron Collider / Amorim, David
The High-Luminosity upgrade of the CERN LHC will increase the performance of the accelerator and the potential physics discoveries [...]
CERN-THESIS-2019-272 -

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2020-01-16
11:13
ATF2 Ultra-low βy∗ study report for March 2019 run / Cilento, Vera (Université Paris-Saclay (FR)) ; Pastushenko, Andrii (Université Paris-Saclay (FR)) ; Yang, Renjun (CERN) ; Tomas Garcia, Rogelio (CERN) ; Faus-Golfe, Angeles (Centre National de la Recherche Scientifique (FR)) ; Terunuma, Nobuhiro ; Okugi, Toshiyuki (KEK) ; Kubo, Kiyoshi
One of the main requests for future linear colliders is to achieve a nanometer vertical beam size at the Interaction Point (IP). [...]
CERN-ACC-NOTE-2020-0006. - 2020. - 15 p.
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2020-01-15
06:01
Effect of Head-Tail Mode Diffusion due to Synchrotron Radiation on Transverse Coupled-Bunch Instabilities with Harmonic-Cavity-Lengthened Bunches / Cullinan, F J (Lund U., MAX-lab ; www.maxiv.lu.se) ; Tavares, P F (Lund U., MAX-lab) ; Nagaoka, R (SOLEIL, Saint-Aubin) ; Skripka, G (CERN)
Many present and future storage-ring-based light sources make use of cavities at a harmonic of the main RF to lengthen the electron bunches. [...]
WSP, 2019. - 8 p.

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2019-12-19
09:42
Challenges for the Electric Field Devices for a CERN Proton EDM Storage Ring / Borburgh, J (CERN) ; Atanasov, M (CERN) ; Goddard, B (CERN) ; Jorat, L (CERN) ; Sgobba, S (CERN)
In the framework of the Physics Beyond Colliders (PBC) study at CERN, the Electric Dipole Moment (EDM) working group is investigating the feasibility of building an approximately 500 m circumference storage ring to precisely measure the permanent electric dipole moment of the proton. Protons are stored in an EDM ring at the so-called `magic' energy of 233 MeV using only electric field elements in order to ensure that spin and momentum vectors precess horizontally at the same rate. [...]
Sept - 4 p. - Published in : 10.1109/DEIV.2018.8537088
In : 28th International Symposium on Discharges and Electrical Insulation in Vacuum, Greifswald, Germany, 23 - 28 Sep 2018, pp.765-768

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2019-12-18
08:05
Automatic detection of transverse beam instabilities in the Large Hadron Collider / Levens, T E (CERN ; Glasgow U.) ; Łasocha, K (CERN ; Jagiellonian U.) ; Lefevre, T (CERN) ; Gąsior, M (CERN) ; Jones, R (CERN) ; Włostowski, T (CERN) ; Ellis, J P (CERN ; Melbourne U.) ; Steinhagen, R J (CERN ; Darmstadt, GSI)
Transverse beam instabilities are a major cause of emittance dilution and beam losses in high intensity hadron accelerators. This paper presents an overview of the system that has been developed for automatic detection of transverse beam instabilities in the Large Hadron Collider at CERN. [...]
2019 - 12 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 112803 Fulltext: PDF;

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2019-12-17
17:36
Optimization of the Beam Screen for the FCC Injection Kicker Magnets / Chmielinska, Agnieszka
The Future Circular Collider for hadrons (FCC-hh) is a proposed high-energy frontier particle accelerator, which would be built in a new ∼100 km circumference tunnel and would enable proton-proton collisions at a centre-of-mass energy of 100 TeV [...]
CERN-THESIS-2019-245 8079. - 200 p.

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